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j guita., fang. @anni @ffih Leim Patent No. 75,961, me March 24, 186s.

IMPnOvsMsNT `IN mss For. srA-MPING TINWARB.

@its .rituale referat tt in tips: Eaters tteut mit making part at 411p: atm/e.

TO.AIL WHOM IT MAY CONCERN:

Be it known that we, Josnrn Nnunnnosn and Parnu J. ILLre.,v of the cityv of Bulalo, in the county of Erie, y

and State of New York, haveinvented certain new and useful Improvements in Dies for Stamping Tinware; and' We do hereby declare that thefollowing is a full and e'xact description thereof, reference being had to the accompanying drawings, making a part of this specification, in which."

Figure I is a section of the primary die, with the piece of tin fed to it.

Figure II is a section of the secondary or finishing-die, showing the piece of tin as formed by the first die and fed to the second. l i

v Figure III illustrates the successive formation of the tin and its shape when inished.

The nature of this invention relates to an improved method of stamping tinware,l and more particularly-to forming articles having sharp edges, such as tin-can covers, toys, 6r necks, and the likem It consists- First, in the construction and use ofaprimary'die for preparing ther-sheetf of"`t`in to be stamped in such manner that its circumference or outer edge, after the tin has been stamped in this die, will be equal to and 4correspond exactly witlfthe circumference of the finished article to be produced'.

v Second, in the construction and use of a finishing-dimhaving a circular ange or shoulder, the circumference of which is equal to that of the piece of tin formed by the first die, and also equal to that of the finished article, so that the former, when fed to the said nishing-die, will t exactly within the said circular ange, and hence, when it is pressed or stamped, cannot spread outwardly, but allow and compel the tin to contract radially toward the centre, thereby forming the sharp edges with a sucient quantity or thickness of metal to prevent their tearingor splitting while being stamped.

Third, in forming sharp-edged tinware by stamping a dat piece of tin first in a primary die, and then in a finishing-die having a. ange, for the purpose of. making the edges or creases in the article, when complete, as

, strong as any other part thereof, and prevent their tearing while being stamped.

In the accompanying drawings, letters of like name and kind refer to like parts in each of the figures.

A represents the primary die, and a' a piece of round dat tin, which is fed thereto to be stamped. B represents the secondary or nishing-die, having a ange or shoulder, b,'and Iz is the piece of tin which has been formed upon the first die, andis fed to the second die, as shown in Fig. II. C, Fig. III, represents the article when finished. The article represented in the drawings forthe purpose of illustrating this invention is the neck and flange of la fruit-can, which 'we manufacture under Letters Patent-granted to us, April 11,JI '86. i

Great inconvenience hasbeen' experienced in the manufacture of tinware-for thel want ofiiin'apparatus or Aa method of stamping such articles as.tin-can covers, necks, 'or tops, and the like. The inferior quality of metal generally used for the purpose cannot be stamped or pressed between dies into any desired shape and form; it breaks and tears at sharp edges almost invariably, not having the yielding and ductile qualities of brass, copper, and other superior and more expensive metals. There are a great many articles of tinware which have slmrpedges; these edges are formed by pressing the metal at right angles, or nearly so. 'This cannot be done without one or more so-called coaxing-dies, and' a greatnumberof blows, for the purpose of forming the metal in a gradual, ,progressive mannern util4 it is stamped uponthe -last die into the proper shape and, even when this precaution is taken, it is utterly impossible tostamp out sharp edges without tearing or breaking the metal at those edges. l Y

My improvement obriates this diiiculty, and furnishes a means for stamping put sharpfedged tinware by thc use of only two dies, and only one blow upon each being necessary to'produce the required impression.

The primary die, shown at A, may be made of a form best adapted for the purpose of gradually preparing the metal, being nothing more nor less than a coaxingdie; but one peculiar and particular condition must be complied with in the construction thereof, viz, it must be so constructed that a piece of tinstamped upon this die ,will be'so shaped that its circumference is ,equal to that of the finished article. Then this piece of tinA so formed is fed on to the die B, (which we call the nishingdie,) and placed within the shoulder into which it its. One'blow will now he suiicient to complete the work, and produce the article in the desired shape.

The improvement in this die consistsin the flange or shoulder b', which is made just the size of the finished article. `Without this ange the piece of tin formed by the die A,'or any other coaxing die'would spread out over the required*circumference, and, in almost every case, tear and break Where a sharp edge should be formed. The shoulder b prevents themetsl from spreading out, and compels it to contract towards the centre, and ill the sharp edges with a sufficient quantity and thickness of metal to render the breaking or tearing of the metal impossible.

The advantages derived bythe use of our improvementsin the manufacture of' tinware are very great. Tin may be stamped by means thereof into almost every conceivable shape, and there need be no waste of material, as is often the case when tinware is stamped out in the manner now known, and in common use in the manufacture thereof.

What we claim as our invention, and desire to secure by Letters Patent, is

'1. The primary or coaxingdie A, when constructed and used for the purpose, and substantially as herein described.

2. The secondary or nishing-die B, having a shoulder, b', for the purpose and substantially as herein set forth.

3. ,The secondary or finishing-die B, having a shoulder, b, in combination with the primary or coaxingdieA, for the purposes and substantially as herein described.

. JOSEPH NEUBERGEB.,

PETER J. ILLIG.

Witnesses:

B. H. MUEIILE, F. A. LAnGwoBTHY. 

